Cause : DC Bus Undervoltage comes when there is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.

One of the following conditions occurred while the drive was running:
1. Voltage in the DC bus fell below the undervoltage detection level (L2-05)
2. For 200 V class: approximately 190 V
3. For 400 V class: approximately 380 V (350 V when E1-01 is less than 400)